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  1. AU="Ezaki, Kazune"
  2. AU="Choi, Jong Hyun"
  3. AU="Xie, Qiaowei"
  4. AU=Rojas-Marte G AU=Rojas-Marte G
  5. AU="Belli, A"
  6. AU="Moolman, M Charl"
  7. AU="Mazzoni, Stefania"
  8. AU=Stryjewski Martin E
  9. AU=Vallon Volker AU=Vallon Volker
  10. AU="Knowland, K E"
  11. AU="Beker, M. G."

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  1. Artikel: Precocious cell differentiation occurs in proliferating cells in leaf primordia in Arabidopsis

    Ezaki, Kazune / Koga, Hiroyuki / Takeda-Kamiya, Noriko / Toyooka, Kiminori / Higaki, Takumi / Sakamoto, Shingo / Tsukaya, Hirokazu

    Frontiers in plant science

    2024  Band 15, Seite(n) 1322223

    Abstract: During leaf development, the timing of transition from cell proliferation to expansion is an important factor in determining the final organ size. However, the regulatory system involved in this transition remains less understood. To get an insight into ... ...

    Abstract During leaf development, the timing of transition from cell proliferation to expansion is an important factor in determining the final organ size. However, the regulatory system involved in this transition remains less understood. To get an insight into this system, we investigated the compensation phenomenon, in which the cell number decreases while the cell size increases in organs with determinate growth. Compensation is observed in several plant species suggesting coordination between cell proliferation and expansion. In this study, we examined an Arabidopsis mutant of
    Sprache Englisch
    Erscheinungsdatum 2024-04-16
    Erscheinungsland Switzerland
    Dokumenttyp Journal Article
    ZDB-ID 2613694-6
    ISSN 1664-462X
    ISSN 1664-462X
    DOI 10.3389/fpls.2024.1322223
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Correction: Suppression of class I compensated cell enlargement by xs2 mutation is mediated by salicylic acid signaling.

    Fujikura, Ushio / Ezaki, Kazune / Horiguchi, Gorou / Seo, Mitsunori / Kanno, Yuri / Kamiya, Yuji / Lenhard, Michael / Tsukaya, Hirokazu

    PLoS genetics

    2023  Band 19, Heft 5, Seite(n) e1010775

    Abstract: This corrects the article DOI: 10.1371/journal.pgen.1008873.]. ...

    Abstract [This corrects the article DOI: 10.1371/journal.pgen.1008873.].
    Sprache Englisch
    Erscheinungsdatum 2023-05-19
    Erscheinungsland United States
    Dokumenttyp Published Erratum
    ZDB-ID 2186725-2
    ISSN 1553-7404 ; 1553-7390
    ISSN (online) 1553-7404
    ISSN 1553-7390
    DOI 10.1371/journal.pgen.1010775
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel: Development of a supF-based mutation-detection system in the extreme thermophile Thermus thermophilus HB27

    Togawa, Yoichiro / Shiotani, Shiori / Kato, Yuki / Ezaki, Kazune / Nunoshiba, Tatsuo / Hiratsu, Keiichiro

    Molecular genetics and genomics. 2019 Aug., v. 294, no. 4

    2019  

    Abstract: Thermus thermophilus (T. thermophilus) HB27 is an extreme thermophile that grows optimally at 65–72 °C. Heat-induced DNA lesions are expected to occur at a higher frequency in the genome of T. thermophilus than in those of mesophiles; however, the ... ...

    Abstract Thermus thermophilus (T. thermophilus) HB27 is an extreme thermophile that grows optimally at 65–72 °C. Heat-induced DNA lesions are expected to occur at a higher frequency in the genome of T. thermophilus than in those of mesophiles; however, the mechanisms underlying the maintenance of genome integrity at high temperatures remain poorly understood. The study of mutation spectra has become a powerful approach to understanding the molecular mechanisms responsible for DNA repair and mutagenesis in mesophilic species. Therefore, we developed a supF-based system to detect a broad spectrum of mutations in T. thermophilus. This system was validated by measuring spontaneous mutations in the wild type and a udgA, B double mutant deficient in uracil-DNA glycosylase (UDG) activity. We found that the mutation frequency of the udgA, B strain was 4.7-fold higher than that of the wild type and G:C→A:T transitions dominated, which was the most reasonable for the mutator phenotype associated with the loss of UDG function in T. thermophilus. These results show that this system allowed for the rapid analysis of mutations in T. thermophilus, and may be useful for studying the molecular mechanisms responsible for DNA repair and mutagenesis in this extreme thermophile.
    Schlagwörter DNA ; DNA repair ; Thermus thermophilus ; genome ; genomics ; mesophilic microorganisms ; mutagenesis ; mutants ; mutation rate ; phenotype ; rapid methods ; thermophiles ; uracil-DNA glycosylase
    Sprache Englisch
    Erscheinungsverlauf 2019-08
    Umfang p. 1085-1093.
    Erscheinungsort Springer Berlin Heidelberg
    Dokumenttyp Artikel
    ISSN 1617-4615
    DOI 10.1007/s00438-019-01565-9
    Datenquelle NAL Katalog (AGRICOLA)

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  4. Artikel ; Online: Development of a supF-based mutation-detection system in the extreme thermophile Thermus thermophilus HB27.

    Togawa, Yoichiro / Shiotani, Shiori / Kato, Yuki / Ezaki, Kazune / Nunoshiba, Tatsuo / Hiratsu, Keiichiro

    Molecular genetics and genomics : MGG

    2019  Band 294, Heft 4, Seite(n) 1085–1093

    Abstract: Thermus thermophilus (T. thermophilus) HB27 is an extreme thermophile that grows optimally at 65-72 °C. Heat-induced DNA lesions are expected to occur at a higher frequency in the genome of T. thermophilus than in those of mesophiles; however, the ... ...

    Abstract Thermus thermophilus (T. thermophilus) HB27 is an extreme thermophile that grows optimally at 65-72 °C. Heat-induced DNA lesions are expected to occur at a higher frequency in the genome of T. thermophilus than in those of mesophiles; however, the mechanisms underlying the maintenance of genome integrity at high temperatures remain poorly understood. The study of mutation spectra has become a powerful approach to understanding the molecular mechanisms responsible for DNA repair and mutagenesis in mesophilic species. Therefore, we developed a supF-based system to detect a broad spectrum of mutations in T. thermophilus. This system was validated by measuring spontaneous mutations in the wild type and a udgA, B double mutant deficient in uracil-DNA glycosylase (UDG) activity. We found that the mutation frequency of the udgA, B strain was 4.7-fold higher than that of the wild type and G:C→A:T transitions dominated, which was the most reasonable for the mutator phenotype associated with the loss of UDG function in T. thermophilus. These results show that this system allowed for the rapid analysis of mutations in T. thermophilus, and may be useful for studying the molecular mechanisms responsible for DNA repair and mutagenesis in this extreme thermophile.
    Mesh-Begriff(e) Bacterial Proteins/genetics ; DNA Mutational Analysis/methods ; Hot Temperature ; Mutation ; Mutation Rate ; Thermus thermophilus/genetics ; Thermus thermophilus/growth & development ; Uracil-DNA Glycosidase/genetics
    Chemische Substanzen Bacterial Proteins ; Uracil-DNA Glycosidase (EC 3.2.2.-)
    Sprache Englisch
    Erscheinungsdatum 2019-04-09
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 2044817-X
    ISSN 1617-4623 ; 1617-4615
    ISSN (online) 1617-4623
    ISSN 1617-4615
    DOI 10.1007/s00438-019-01565-9
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  5. Artikel ; Online: Suppression of class I compensated cell enlargement by xs2 mutation is mediated by salicylic acid signaling.

    Fujikura, Ushio / Ezaki, Kazune / Horiguchi, Gorou / Seo, Mitsunori / Kanno, Yuri / Kamiya, Yuji / Lenhard, Michael / Tsukaya, Hirokazu

    PLoS genetics

    2020  Band 16, Heft 6, Seite(n) e1008873

    Abstract: The regulation of leaf size has been studied for decades. Enhancement of post-mitotic cell expansion triggered by impaired cell proliferation in Arabidopsis is an important process for leaf size regulation, and is known as compensation. This suggests a ... ...

    Abstract The regulation of leaf size has been studied for decades. Enhancement of post-mitotic cell expansion triggered by impaired cell proliferation in Arabidopsis is an important process for leaf size regulation, and is known as compensation. This suggests a key interaction between cell proliferation and cell expansion during leaf development. Several studies have highlighted the impact of this integration mechanism on leaf size determination; however, the molecular basis of compensation remains largely unknown. Previously, we identified extra-small sisters (xs) mutants which can suppress compensated cell enlargement (CCE) via a specific defect in cell expansion within the compensation-exhibiting mutant, angustifolia3 (an3). Here we revealed that one of the xs mutants, namely xs2, can suppress CCE not only in an3 but also in other compensation-exhibiting mutants erecta (er) and fugu2. Molecular cloning of XS2 identified a deleterious mutation in CATION CALCIUM EXCHANGER 4 (CCX4). Phytohormone measurement and expression analysis revealed that xs2 shows hyper activation of the salicylic acid (SA) response pathway, where activation of SA response can suppress CCE in compensation mutants. All together, these results highlight the regulatory connection which coordinates compensation and SA response.
    Mesh-Begriff(e) Antiporters/genetics ; Arabidopsis/physiology ; Arabidopsis Proteins/genetics ; Arabidopsis Proteins/metabolism ; Calcium/metabolism ; Cations, Divalent/metabolism ; Cell Enlargement ; Cell Proliferation/genetics ; Gene Expression Regulation, Plant ; Loss of Function Mutation ; Organ Size/genetics ; Plant Growth Regulators/metabolism ; Plant Leaves/cytology ; Plant Leaves/growth & development ; Plant Leaves/metabolism ; Plants, Genetically Modified ; Salicylic Acid/metabolism ; Signal Transduction/genetics
    Chemische Substanzen Antiporters ; Arabidopsis Proteins ; Cations, Divalent ; NPR1 protein, Arabidopsis ; Plant Growth Regulators ; Salicylic Acid (O414PZ4LPZ) ; Calcium (SY7Q814VUP)
    Sprache Englisch
    Erscheinungsdatum 2020-06-25
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2186725-2
    ISSN 1553-7404 ; 1553-7390
    ISSN (online) 1553-7404
    ISSN 1553-7390
    DOI 10.1371/journal.pgen.1008873
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  6. Artikel ; Online: Morphological characterization of domatium development in Callicarpa saccata.

    Sarath, Emma / Ezaki, Kazune / Sasaki, Takenori / Maekawa, Yu / Sawada, Yuji / Hirai, Masami Yokota / Soejima, Akiko / Tsukaya, Hirokazu

    Annals of botany

    2019  Band 125, Heft 3, Seite(n) 521–532

    Abstract: Background and aims: Domatia are plant structures within which organisms reside. Callicarpa saccata (Lamiaceae) is the sole myrmecophyte, or 'ant plant', that develops foliar (leaf-borne) myrmeco-domatia in this genus. In this work we examined domatium ... ...

    Abstract Background and aims: Domatia are plant structures within which organisms reside. Callicarpa saccata (Lamiaceae) is the sole myrmecophyte, or 'ant plant', that develops foliar (leaf-borne) myrmeco-domatia in this genus. In this work we examined domatium development in C. saccata to understand the developmental processes behind pouch-like domatia.
    Methods: Scanning electron microscopy, sectioning and microcomputed tomography were carried out to compare the leaves of C. saccata with those of the closely related but domatia-less myrmecophyte Callicarpa subaequalis, both under cultivation without ants.
    Key results: Callicarpa saccata domatia are formed as a result of excess cell proliferation at the blade/petiole junctions of leaf primordia. Blade/petiole junctions are important meristematic sites in simple leaf organogenesis. We also found that the mesophyll tissue of domatia does not clearly differentiate into palisade and spongy layers.
    Conclusions: Rather than curling of the leaf margins, a perturbation of the normal functioning of the blade/petiole junction results in the formation of domatium tissue. Excess cell proliferation warps the shape of the blade and disturbs the development of the proximal-distal axis. This process leads to the generation of distinct structures that facilitate interaction between C. saccata and ants.
    Mesh-Begriff(e) Animals ; Ants ; Callicarpa ; Plant Leaves ; Symbiosis ; X-Ray Microtomography
    Sprache Englisch
    Erscheinungsdatum 2019-11-25
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1461328-1
    ISSN 1095-8290 ; 0305-7364
    ISSN (online) 1095-8290
    ISSN 0305-7364
    DOI 10.1093/aob/mcz193
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  7. Artikel ; Online: Morphological and phylogenetic investigations for several cryptic ant-plants found in Callicarpa (Lamiaceae) from Borneo.

    Nakashima, Shota / Sarath, Emma / Okada, Hiroshi / Ezaki, Kazune / Darnaedi, Dedy / Tsukaya, Hirokazu / Soejima, Akiko

    Journal of plant research

    2016  Band 129, Heft 4, Seite(n) 591–601

    Abstract: A tropical small tree, Callicarpa saccata, is known to have a symbiotic relationship with ants. It has sac-like structures at the base of the leaves that are inhabited by ants. No other species has been determined to be a myrmecophyte among the ca. 140 ... ...

    Abstract A tropical small tree, Callicarpa saccata, is known to have a symbiotic relationship with ants. It has sac-like structures at the base of the leaves that are inhabited by ants. No other species has been determined to be a myrmecophyte among the ca. 140 species of this genus. However, our recent field investigation discovered that two other species on Borneo (C. barbata and C. teneriflora) have hollow stems, which seem to be inhabited by ants. We observed the morphological features of these species in relation to their usage by ants, and became convinced that they are mymecophytic species. The molecular phylogenetic analyses using ITS and chloroplast regions suggest that C. saccata and C. teneriflora are closely related, but the differences in the myrmecophytic features of these species should be noted.
    Mesh-Begriff(e) Animals ; Ants/physiology ; Base Sequence ; Bayes Theorem ; Borneo ; Lamiaceae/anatomy & histology ; Lamiaceae/physiology ; Phylogeny ; Plant Leaves/anatomy & histology ; Plant Stems/anatomy & histology
    Sprache Englisch
    Erscheinungsdatum 2016-07
    Erscheinungsland Japan
    Dokumenttyp Journal Article
    ZDB-ID 2077362-6
    ISSN 1618-0860 ; 0918-9440
    ISSN (online) 1618-0860
    ISSN 0918-9440
    DOI 10.1007/s10265-016-0820-5
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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